from tkinter import * 

win = Tk()
win.geometry('600x400')
win.title('密码验证')
#发送按钮事件
def mClick():
  txt = txt2.get()
  if(txt == 'abc'):
      txt3.set("欢迎进入本系统")
  else:
      txt3.set("密码错误")

#创建几个组件元素
lab1=Label(win, text="请输入用户名：",font=('华文新魏','16'))
lab2=Label(win, text="请输入密  码：",font=('华文新魏','16'))
txt1=StringVar()
txt2=StringVar()
txt3=StringVar()
txt3.set("请输入用户名和密码")
entry1 = Entry(win,textvariable=txt1, width=16,font=('宋体','16') ) 
entry2 = Entry(win,textvariable=txt2,width=16,show='*',font=('宋体','16')) 
button = Button(win, text='提交', command=mClick,font=('宋体','16')) 
lab3=Label(win,textvariable=txt3,relief='ridge',width=30,font=('华文新魏','16')) 

#布局设置
lab1.grid(row=0,column=0)
lab2.grid(row=1,column=0)
entry1.grid(row=0,column=1)
entry2.grid(row=1,column=1)
lab3.grid(row=2,column=0,columnspan=2)
button.grid(row=2,column=2)

win.mainloop()
